Tell me what you think.

I would tell them to read a book called Denying History, because that is exactly what they are doing. I'd tell them to take a look at pictures of Hitler looking over gas chamber blueprints with his SS officers. I would tell them to read documents sent back and forth from Franklin D. Roosevelt and Winston Churchill talking about the camps, I would tell them to look at the picture of Eisenhower visitng a camp in Western Europe, I would tell them to listen to the testemonies of Russian, British and American troops who liberated the camps, I would tell them to listen to the testimonies of the Nazi's themselves who admitted many things, I would tell them to look at the aerial photos taken by the allies of the camps, I would tell them to stop making stuff up and finally that they are not historians or scholars so their credibility is slim if none at all and they are trying to use a pebble's worth of evidence which supports their claims and they are trying to bring down a mountain of evidence that disproves their claim, then I'd walk away.

I disagree that people who believe the holocaust didn't happen are "hyper-religious" (whatever that means?) Many of the people who hid Jews were devout Christians (if you've read or seen the movie The Hiding Place, it is about a Dutch Christian family who not only hid many Jews, but were sent to the camps along with those they are hiding, where all but one perished.) Those who deny the holocaust are usually racist pigs and neo-Nazi's. This is why the media was sent in - the American and British knew that the horror of it was huge; so huge that eventually people would "deny" that it happened, or was as bad as it was. Therefore cameras, some taking color footage, were brought into the camps and as much as possible was recorded in that way. The residents of nearby towns and cities were forced to walk through and tour the camps, before the bodies were even gone, so they too could witness the horror.
Unfortunately , it didn't seem to have much effect; Hitler's racist brainwashing was too deeply ingrained. When the Jews came out of the camps and were back into society, antisemitism was as strong as ever and unfortunately continues today. If you look at some of the Youtube comments, they are really sick; people who still think Hitler was right and justified......